<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>parent</title>
<script>
    function parentFunction() {
        alert('function in parent');
    }

    function callChild() {
        child.window.childFunction();
        /*
			child 为iframe的name属性值，
			不能为id，因为在FireFox下id不能获取iframe对象
		*/
    }
</script>
</head>
<body>
<input type="button" name="call child"  value="call child" onclick="callChild()"/>
<br/><br/>
<iframe name="child" src="./b.html" ></iframe>
</body>
</html>